The bike seems to come equipped with IRC tires. IRC Trails GP 21-F / 22-R to be exact. I’ve never heard of IRC tires until now, but at least they look ok. I’ll keep an open mind an see how they work.
REAR 120/80-18 M/C 62P
FRONT 3.00 – 21 51P
STOCK RIMS on the CRF 250 Rally are
D.I.D JAPAN 96 –08 08–
J 21 x 1.60 9 16 DOT
D.I.D JAPAN 92 — 10 1415
J 18×2.15 9 16 DOT
Pay attention when ordering new tires. You can fit lots of different tires on the rim, but may run in to trouble with clearance. I mounted a 120/90 – 18 Mitas Co2 at the rear, but the swing is not long enough to actually run that tire. The width was ok, but as the tire was a studded winter tire there was only a 3mm clearance to the rear swing AFTER removing the mud flap. Go there -> https://honda250rally.com/2017/11/11/preparing-for-winter/ to laught at my mistake.